The thought ocurred to me that there might be a green way of waterproofing a (wooden) roof using some sort of tree resin, or a mixture of different resins or another compound. I'm posting this to encourage brainstorming on this as I was surprised to not being able to find anything concrete on this through google.
I suppose tar could be called natural, but hardly green because of all the carcinogens in it. But resins seem to me to be a viable candidate to start with. As I understand pine resin, if used, would have to be mixed with something to stop it from setting completely in cold weather and cracking? What could accomplish this?
What have you guys used? How did you fare?
(WHOA! Why does my name have "Hatfield" in it allofasudden?? What is Hatfield anyway?)